The right side of the neck is a little bit swollen may muscle strain, cervical vertebrae misalignment, lymphadenitis. 1. Muscle strain: when suddenly turning the neck may cause muscle strain around the neck, localized swelling, pain, and limited cervical spine movement. 2. Cervical vertebrae misalignment: when the cervical vertebrae misalignment occurs, it will cause asymmetry between the two sides of the neck, accompanied by localized swelling, limited cervical spine rotation and pain. 3. Lymphadenitis: When inflammation of the throat is secondary to inflammation of the cervical lymph nodes, localized enlargement can occur and enlarged lymph nodes can be felt. Suddenly appeared the right side of the neck swelling, if accompanied by pain, it is best to go to the hospital for examination, clear cause for treatment. So as not to delay the treatment.